反应详情

Phenylhydrazine (17.4 ml) was added over 15 min to a stirred suspension of 2,4-piperidinedione (20 g) in ethanol (200 ml) at ca. 20°. The resulting suspension was diluted with ethanol (80 ml) and water (300 ml) and the solid was filtered off to give the title compound (23.31 g), m.p. 165°-168°.

1. filtrationthe solid was filtered off